Install a driver callback for IRQ acknowledge. This callback is used to get a vector for an IRQ line.

Declared in src/emu/cpuint.h as

void cpunum_set_irq_callback(int cpunum, int (*callback)(int irqline));

• cpunum – Index to the CPU
• *callback – Pointer to a function that will be called when this IRQ is fired.

Nothing.

static int irq_callback(int irq)
{
    return vectors[current_vector];
}
 
cpunum_set_irq_callback(0, irq_callback);

Function irq_callback will be called when the first CPU acknowledges an interrupt. As vector the CPU will receive a value from the array vectors.

• cpunum_set_input_line()
• cpunum_set_input_line_and_vector()
• cpunum_set_input_line_vector()